Re: [PATCH 03/16] powerpc: Fix objtool unannotated intra-function call warnings

From: Christophe Leroy
Date: Wed Aug 10 2022 - 04:33:10 EST

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In reply to: Sathvika Vasireddy: "[PATCH 03/16] powerpc: Fix objtool unannotated intra-function call warnings"
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Le 08/08/2022 à 13:48, Sathvika Vasireddy a écrit :
> objtool throws unannotated intra-function call warnings
> in the following assembly files.
>
> arch/powerpc/kernel/vector.o: warning: objtool: .text+0x53c: unannotated intra-function call
>
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0x60: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0x124: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0x5d4: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0x5dc: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xcb8: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xd0c: unannotated intra-function call
> arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0x1030: unannotated intra-function call
>
> arch/powerpc/kernel/head_64.o: warning: objtool: .text+0x358: unannotated intra-function call
> arch/powerpc/kernel/head_64.o: warning: objtool: .text+0x728: unannotated intra-function call
> arch/powerpc/kernel/head_64.o: warning: objtool: .text+0x4d94: unannotated intra-function call
> arch/powerpc/kernel/head_64.o: warning: objtool: .text+0x4ec4: unannotated intra-function call
>
> arch/powerpc/kvm/book3s_hv_interrupts.o: warning: objtool: .text+0x6c: unannotated intra-function call
> arch/powerpc/kernel/misc_64.o: warning: objtool: .text+0x64: unannotated intra-function call
>

Before explaining how you fix it, can you explain why we get it ?

> Fix these warnings by annotating those functions with
> SYM_FUNC_START_LOCAL() and SYM_FUNC_END() macros.
>
> Signed-off-by: Sathvika Vasireddy <sv@xxxxxxxxxxxxx>
> ---
> arch/powerpc/kernel/exceptions-64s.S | 7 +++++--
> arch/powerpc/kernel/head_64.S | 7 +++++--
> arch/powerpc/kernel/misc_64.S | 4 +++-
> arch/powerpc/kernel/vector.S | 4 +++-
> arch/powerpc/kvm/book3s_hv_interrupts.S | 4 +++-
> arch/powerpc/kvm/book3s_hv_rmhandlers.S | 22 +++++++++++++++-------
> 6 files changed, 34 insertions(+), 14 deletions(-)
>
> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
> index 3d0dc133a9ae..4242c1a20bcd 100644
> --- a/arch/powerpc/kernel/exceptions-64s.S
> +++ b/arch/powerpc/kernel/exceptions-64s.S
> @@ -20,6 +20,7 @@
> #include <asm/head-64.h>
> #include <asm/feature-fixups.h>
> #include <asm/kup.h>
> +#include <linux/linkage.h>
>
> /*
> * Following are fixed section helper macros.
> @@ -3075,7 +3076,7 @@ CLOSE_FIXED_SECTION(virt_trampolines);
> USE_TEXT_SECTION()
>
> /* MSR[RI] should be clear because this uses SRR[01] */
> -enable_machine_check:
> +SYM_FUNC_START_LOCAL(enable_machine_check)
> mflr r0
> bcl 20,31,$+4
> 0: mflr r3
> @@ -3087,9 +3088,10 @@ enable_machine_check:
> RFI_TO_KERNEL
> 1: mtlr r0
> blr
> +SYM_FUNC_END(enable_machine_check)
>
> /* MSR[RI] should be clear because this uses SRR[01] */
> -disable_machine_check:
> +SYM_FUNC_START_LOCAL(disable_machine_check)
> mflr r0
> bcl 20,31,$+4
> 0: mflr r3
> @@ -3102,3 +3104,4 @@ disable_machine_check:
> RFI_TO_KERNEL
> 1: mtlr r0
> blr
> +SYM_FUNC_END(disable_machine_check)
> diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
> index cf2c08902c05..10e2d43420d0 100644
> --- a/arch/powerpc/kernel/head_64.S
> +++ b/arch/powerpc/kernel/head_64.S
> @@ -18,6 +18,7 @@
> * variants.
> */
>
> +#include <linux/linkage.h>
> #include <linux/threads.h>
> #include <linux/init.h>
> #include <asm/reg.h>
> @@ -465,7 +466,7 @@ generic_secondary_common_init:
> * Assumes we're mapped EA == RA if the MMU is on.
> */
> #ifdef CONFIG_PPC_BOOK3S
> -__mmu_off:
> +SYM_FUNC_START_LOCAL(__mmu_off)
> mfmsr r3
> andi. r0,r3,MSR_IR|MSR_DR
> beqlr
> @@ -476,6 +477,7 @@ __mmu_off:
> sync
> rfid
> b . /* prevent speculative execution */
> +SYM_FUNC_END(__mmu_off)
> #endif
>
>
> @@ -869,7 +871,7 @@ _GLOBAL(start_secondary_resume)
> /*
> * This subroutine clobbers r11 and r12
> */
> -enable_64b_mode:
> +SYM_FUNC_START_LOCAL(enable_64b_mode)
> mfmsr r11 /* grab the current MSR */
> #ifdef CONFIG_PPC_BOOK3E
> oris r11,r11,0x8000 /* CM bit set, we'll set ICM later */
> @@ -881,6 +883,7 @@ enable_64b_mode:
> isync
> #endif
> blr
> +SYM_FUNC_END(enable_64b_mode)
>
> /*
> * This puts the TOC pointer into r2, offset by 0x8000 (as expected
> diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
> index fd6d8d3a548e..b36fb89ff718 100644
> --- a/arch/powerpc/kernel/misc_64.S
> +++ b/arch/powerpc/kernel/misc_64.S
> @@ -9,6 +9,7 @@
> * PPC64 updates by Dave Engebretsen (engebret@xxxxxxxxxx)
> */
>
> +#include <linux/linkage.h>
> #include <linux/sys.h>
> #include <asm/unistd.h>
> #include <asm/errno.h>
> @@ -353,7 +354,7 @@ _GLOBAL(kexec_smp_wait)
> *
> * don't overwrite r3 here, it is live for kexec_wait above.
> */
> -real_mode: /* assume normal blr return */
> +SYM_FUNC_START_LOCAL(real_mode) /* assume normal blr return */
> #ifdef CONFIG_PPC_BOOK3E
> /* Create an identity mapping. */
> b kexec_create_tlb
> @@ -370,6 +371,7 @@ real_mode: /* assume normal blr return */
> mtspr SPRN_SRR0,r11
> rfid
> #endif
> +SYM_FUNC_END(real_mode)
>
> /*
> * kexec_sequence(newstack, start, image, control, clear_all(),
> diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S
> index 5cc24d8cce94..fb96aed2b5c3 100644
> --- a/arch/powerpc/kernel/vector.S
> +++ b/arch/powerpc/kernel/vector.S
> @@ -9,6 +9,7 @@
> #include <asm/ptrace.h>
> #include <asm/export.h>
> #include <asm/asm-compat.h>
> +#include <linux/linkage.h>
>
> /*
> * Load state from memory into VMX registers including VSCR.
> @@ -186,7 +187,7 @@ fphalf:
> * Internal routine to enable floating point and set FPSCR to 0.
> * Don't call it from C; it doesn't use the normal calling convention.
> */
> -fpenable:
> +SYM_FUNC_START_LOCAL(fpenable)
> #ifdef CONFIG_PPC32
> stwu r1,-64(r1)
> #else
> @@ -203,6 +204,7 @@ fpenable:
> mffs fr31
> MTFSF_L(fr1)
> blr
> +SYM_FUNC_END(fpenable)
>
> fpdisable:
> mtlr r12
> diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S
> index 59d89e4b154a..c0deeea7eef3 100644
> --- a/arch/powerpc/kvm/book3s_hv_interrupts.S
> +++ b/arch/powerpc/kvm/book3s_hv_interrupts.S
> @@ -9,6 +9,7 @@
> * Authors: Alexander Graf <agraf@xxxxxxx>
> */
>
> +#include <linux/linkage.h>
> #include <asm/ppc_asm.h>
> #include <asm/kvm_asm.h>
> #include <asm/reg.h>
> @@ -107,7 +108,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
> /*
> * void kvmhv_save_host_pmu(void)
> */
> -kvmhv_save_host_pmu:
> +SYM_FUNC_START_LOCAL(kvmhv_save_host_pmu)
> BEGIN_FTR_SECTION
> /* Work around P8 PMAE bug */
> li r3, -1
> @@ -154,3 +155,4 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> stw r8, HSTATE_PMC5(r13)
> stw r9, HSTATE_PMC6(r13)
> 31: blr
> +SYM_FUNC_END(kvmhv_save_host_pmu)
> diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> index 7ded202bf995..de91118df0c5 100644
> --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> @@ -29,6 +29,7 @@
> #include <asm/asm-compat.h>
> #include <asm/feature-fixups.h>
> #include <asm/cpuidle.h>
> +#include <linux/linkage.h>
>
> /* Values in HSTATE_NAPPING(r13) */
> #define NAPPING_CEDE 1
> @@ -2358,7 +2359,7 @@ hmi_realmode:
> * This routine calls kvmppc_read_intr, a C function, if an external
> * interrupt is pending.
> */
> -kvmppc_check_wake_reason:
> +SYM_FUNC_START_LOCAL(kvmppc_check_wake_reason)
> mfspr r6, SPRN_SRR1
> BEGIN_FTR_SECTION
> rlwinm r6, r6, 45-31, 0xf /* extract wake reason field (P8) */
> @@ -2427,6 +2428,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> addi r1, r1, PPC_MIN_STKFRM
> mtlr r0
> blr
> +SYM_FUNC_END(kvmppc_check_wake_reason)
>
> /*
> * Save away FP, VMX and VSX registers.
> @@ -2434,7 +2436,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> * N.B. r30 and r31 are volatile across this function,
> * thus it is not callable from C.
> */
> -kvmppc_save_fp:
> +SYM_FUNC_START_LOCAL(kvmppc_save_fp)
> mflr r30
> mr r31,r3
> mfmsr r5
> @@ -2462,6 +2464,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
> stw r6,VCPU_VRSAVE(r31)
> mtlr r30
> blr
> +SYM_FUNC_END(kvmppc_save_fp)
>
> /*
> * Load up FP, VMX and VSX registers
> @@ -2469,7 +2472,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
> * N.B. r30 and r31 are volatile across this function,
> * thus it is not callable from C.
> */
> -kvmppc_load_fp:
> +SYM_FUNC_START_LOCAL(kvmppc_load_fp)
> mflr r30
> mr r31,r4
> mfmsr r9
> @@ -2498,6 +2501,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
> mtlr r30
> mr r4,r31
> blr
> +SYM_FUNC_END(kvmppc_load_fp)
>
> #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
> /*
> @@ -2746,7 +2750,7 @@ kvmppc_bad_host_intr:
> * r9 has a vcpu pointer (in)
> * r0 is used as a scratch register
> */
> -kvmppc_msr_interrupt:
> +SYM_FUNC_START_LOCAL(kvmppc_msr_interrupt)
> rldicl r0, r11, 64 - MSR_TS_S_LG, 62
> cmpwi r0, 2 /* Check if we are in transactional state.. */
> ld r11, VCPU_INTR_MSR(r9)
> @@ -2755,13 +2759,14 @@ kvmppc_msr_interrupt:
> li r0, 1
> 1: rldimi r11, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG
> blr
> +SYM_FUNC_END(kvmppc_msr_interrupt)
>
> /*
> * void kvmhv_load_guest_pmu(struct kvm_vcpu *vcpu)
> *
> * Load up guest PMU state. R3 points to the vcpu struct.
> */
> -kvmhv_load_guest_pmu:
> +SYM_FUNC_START_LOCAL(kvmhv_load_guest_pmu)
> mr r4, r3
> mflr r0
> li r3, 1
> @@ -2811,13 +2816,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> isync
> mtlr r0
> blr
> +SYM_FUNC_END(kvmhv_load_guest_pmu)
>
> /*
> * void kvmhv_load_host_pmu(void)
> *
> * Reload host PMU state saved in the PACA by kvmhv_save_host_pmu.
> */
> -kvmhv_load_host_pmu:
> +SYM_FUNC_START_LOCAL(kvmhv_load_host_pmu)
> mflr r0
> lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */
> cmpwi r4, 0
> @@ -2859,6 +2865,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> isync
> mtlr r0
> 23: blr
> +SYM_FUNC_END(kvmhv_load_host_pmu)
>
> /*
> * void kvmhv_save_guest_pmu(struct kvm_vcpu *vcpu, bool pmu_in_use)
> @@ -2866,7 +2873,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> * Save guest PMU state into the vcpu struct.
> * r3 = vcpu, r4 = full save flag (PMU in use flag set in VPA)
> */
> -kvmhv_save_guest_pmu:
> +SYM_FUNC_START_LOCAL(kvmhv_save_guest_pmu)
> mr r9, r3
> mr r8, r4
> BEGIN_FTR_SECTION
> @@ -2942,6 +2949,7 @@ BEGIN_FTR_SECTION
> mtspr SPRN_MMCRS, r4
> END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
> 22: blr
> +SYM_FUNC_END(kvmhv_save_guest_pmu)
>
> /*
> * This works around a hardware bug on POWER8E processors, where

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In reply to: Sathvika Vasireddy: "[PATCH 03/16] powerpc: Fix objtool unannotated intra-function call warnings"
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