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gcc-9: properly declare the {pv,hv}clock_page storage

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commit 459e3a2153 upstream.

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 <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Torvalds
2019-05-01 11:20:53 -07:00
committed by Greg Kroah-Hartman
parent a22c63764d
commit f73e824544
1 changed files with 2 additions and 2 deletions
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4
arch/x86/entry/vdso/vclock_gettime.c
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@@ -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