[PATCH RESEND v2] arm64: clean the additional checks before calling ghes_notify_sea()

[Dongjiu Geng]

In order to remove the additional check before calling the
ghes_notify_sea(), make stub definition when !CONFIG_ACPI_APEI_SEA.

After this cleanup, we can simply call the ghes_notify_sea() to let
APEI driver handle the SEA notification.

CC: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx>
CC: James Morse <james.morse@xxxxxxx>
Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
---
This cleanup is ever mentioned by Mark Rutland in [1]

[1]:
https://lkml.org/lkml/2018/5/31/289

Change since v1:
1. Update the commit messages
2. CC Tyler and James
3. Add Acked-by of Will
---
 arch/arm64/mm/fault.c | 7 +------
 include/acpi/ghes.h   | 4 ++++
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index b8eecc7..9ffe01d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -727,12 +727,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 
 int handle_guest_sea(phys_addr_t addr, unsigned int esr)
 {
-	int ret = -ENOENT;
-
-	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA))
-		ret = ghes_notify_sea();
-
-	return ret;
+	return ghes_notify_sea();
 }
 
 asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 1624e2b..82cb4eb 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -118,6 +118,10 @@ static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
 	     (void *)section - (void *)(estatus + 1) < estatus->data_length; \
 	     section = acpi_hest_get_next(section))
 
+#ifdef CONFIG_ACPI_APEI_SEA
 int ghes_notify_sea(void);
+#else
+static inline int ghes_notify_sea(void) { return -ENOENT; }
+#endif
 
 #endif /* GHES_H */
-- 
1.9.1