Commit e6c8bf1d authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Greg Kroah-Hartman

powerpc/asm: Mark cr0 as clobbered in mftb()

commit 2400fd82 upstream.

The workaround for the CELL timebase bug does not correctly mark cr0 as
being clobbered. This means GCC doesn't know that the asm block changes cr0 and
might leave the result of an unrelated comparison in cr0 across the block, which
we then trash, leading to basically random behaviour.

Fixes: 859deea9 ("[POWERPC] Cell timebase bug workaround")
Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
[mpe: Tweak change log and flag for stable]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0b422679
......@@ -1303,7 +1303,7 @@ static inline void msr_check_and_clear(unsigned long bits)
" .llong 0\n" \
".previous" \
: "=r" (rval) \
: "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL)); \
: "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL) : "cr0"); \
rval;})
#else
#define mftb() ({unsigned long rval; \
......
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