Re: HPET regression in 2.6.26 versus 2.6.25 -- experimental revert for 2.6.27 failed

[Yinghai Lu]

please try attached patch with 2.6.27-rc3

Thanks

Yinghai Lu
[PATCH] x86: revert back to use request_resource to reserve kernel res

Signed-off-by: Yinghai Lu <yhlu.kernel@xxxxxxxxx>

---
 arch/x86/kernel/e820.c  |   17 +++++++++++++++--
 arch/x86/kernel/setup.c |   22 +++++++++++++++-------
 include/asm-x86/e820.h  |    3 ++-
 3 files changed, 32 insertions(+), 10 deletions(-)

Index: linux-2.6/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820.c
+++ linux-2.6/arch/x86/kernel/e820.c
@@ -1267,7 +1267,7 @@ static inline const char *e820_type_to_s
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
-void __init e820_reserve_resources(void)
+void __init e820_reserve_resources(struct resource **res_kernel, int nr_res_k)
 {
 	int i;
 	struct resource *res;
@@ -1287,7 +1287,20 @@ void __init e820_reserve_resources(void)
 		res->end = end;
 
 		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-		insert_resource(&iomem_resource, res);
+		request_resource(&iomem_resource, res);
+		if (e820.map[i].type == E820_RAM) {
+			int j;
+			/*
+			* We don't know which RAM region contains kernel data,
+			* so we try it repeatedly and let the resource manager
+			* test it.
+			*/
+			for (j = 0; j < nr_res_k; j++) {
+				if (!res_kernel[j])
+					continue;
+				request_resource(res, res_kernel[j]);
+			}
+		}
 		res++;
 	}
 
Index: linux-2.6/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup.c
+++ linux-2.6/arch/x86/kernel/setup.c
@@ -437,6 +437,7 @@ static void __init reserve_early_setup_d
  * --------- Crashkernel reservation ------------------------------
  */
 
+static struct resource *crashk_res_ptr;
 #ifdef CONFIG_KEXEC
 
 /**
@@ -517,7 +518,7 @@ static void __init reserve_crashkernel(v
 
 	crashk_res.start = crash_base;
 	crashk_res.end   = crash_base + crash_size - 1;
-	insert_resource(&iomem_resource, &crashk_res);
+	crashk_res_ptr = &crashk_res;
 }
 #else
 static void __init reserve_crashkernel(void)
@@ -593,6 +594,9 @@ struct x86_quirks *x86_quirks __initdata
 
 void __init setup_arch(char **cmdline_p)
 {
+	struct resource *res_kernel[4];
+	int num_res;
+
 #ifdef CONFIG_X86_32
 	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 	visws_early_detect();
@@ -699,11 +703,6 @@ void __init setup_arch(char **cmdline_p)
 	probe_roms();
 #endif
 
-	/* after parse_early_param, so could debug it */
-	insert_resource(&iomem_resource, &code_resource);
-	insert_resource(&iomem_resource, &data_resource);
-	insert_resource(&iomem_resource, &bss_resource);
-
 	if (efi_enabled)
 		efi_init();
 
@@ -865,7 +864,16 @@ void __init setup_arch(char **cmdline_p)
 
 	kvm_guest_init();
 
-	e820_reserve_resources();
+	res_kernel[0] = &code_resource;
+	res_kernel[1] = &data_resource;
+	res_kernel[2] = &bss_resource;
+	num_res = 3;
+	if (crashk_res_ptr) {
+		res_kernel[num_res] = crashk_res_ptr;
+		num_res++;
+	}
+	e820_reserve_resources(res_kernel, num_res);
+
 	e820_mark_nosave_regions(max_low_pfn);
 
 #ifdef CONFIG_X86_32
Index: linux-2.6/include/asm-x86/e820.h
===================================================================
--- linux-2.6.orig/include/asm-x86/e820.h
+++ linux-2.6/include/asm-x86/e820.h
@@ -120,7 +120,8 @@ extern void e820_register_active_regions
 					 unsigned long end_pfn);
 extern u64 e820_hole_size(u64 start, u64 end);
 extern void finish_e820_parsing(void);
-extern void e820_reserve_resources(void);
+struct resource;
+extern void e820_reserve_resources(struct resource **res, int num);
 extern void setup_memory_map(void);
 extern char *default_machine_specific_memory_setup(void);
 extern char *machine_specific_memory_setup(void);