From: Linus Torvalds Date: Wed, 1 May 2019 18:20:53 +0000 (-0700) Subject: gcc-9: properly declare the {pv,hv}clock_page storage X-Git-Tag: v5.1~19 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=459e3a21535a;p=linux.git gcc-9: properly declare the {pv,hv}clock_page storage The pvlock_page and hvclock_page variables are (as the name implies) addresses to pages, created by the linker script. But we declared them as just "extern u8" variables, which _works_, but now that gcc does some more bounds checking, it causes warnings like warning: array subscript 1 is outside array bounds of ‘u8[1]’ when we then access more than one byte from those variables. Fix this by simply making the declaration of the variables match reality, which makes the compiler happy too. Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/entry/vdso/vclock_gettime.c b/arch/x86/entry/vdso/vclock_gettime.c index 007b3fe9d727..98c7d12b945c 100644 --- a/arch/x86/entry/vdso/vclock_gettime.c +++ b/arch/x86/entry/vdso/vclock_gettime.c @@ -29,12 +29,12 @@ extern int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz); extern time_t __vdso_time(time_t *t); #ifdef CONFIG_PARAVIRT_CLOCK -extern u8 pvclock_page +extern u8 pvclock_page[PAGE_SIZE] __attribute__((visibility("hidden"))); #endif #ifdef CONFIG_HYPERV_TSCPAGE -extern u8 hvclock_page +extern u8 hvclock_page[PAGE_SIZE] __attribute__((visibility("hidden"))); #endif