From: Anders Roxell anders.roxell@linaro.org
commit d78c8e32890ef7eca79ffd67c96022c7f9d8cce4 upstream.
Clang warns:
arch/powerpc/mm/book3s64/radix_tlb.c:1191:23: error: variable 'hstart' is uninitialized when used here __tlbiel_va_range(hstart, hend, pid, ^~~~~~ arch/powerpc/mm/book3s64/radix_tlb.c:1191:31: error: variable 'hend' is uninitialized when used here __tlbiel_va_range(hstart, hend, pid, ^~~~
Rework the 'if (IS_ENABLE(CONFIG_TRANSPARENT_HUGEPAGE))' so hstart/hend is always initialized to silence the warnings. That will also simplify the 'else' path. Clang is getting confused with these warnings, but the warnings is a false-positive.
Suggested-by: Arnd Bergmann arnd@arndb.de Suggested-by: Nathan Chancellor nathan@kernel.org Reviewed-by: Christophe Leroy christophe.leroy@csgroup.eu Reviewed-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Anders Roxell anders.roxell@linaro.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20220810114318.3220630-1-anders.roxell@linaro.org Signed-off-by: Daniel Díaz daniel.diaz@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/mm/book3s64/radix_tlb.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
--- a/arch/powerpc/mm/book3s64/radix_tlb.c +++ b/arch/powerpc/mm/book3s64/radix_tlb.c @@ -1179,15 +1179,12 @@ static inline void __radix__flush_tlb_ra } } } else { - bool hflush = false; + bool hflush; unsigned long hstart, hend;
- if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { - hstart = (start + PMD_SIZE - 1) & PMD_MASK; - hend = end & PMD_MASK; - if (hstart < hend) - hflush = true; - } + hstart = (start + PMD_SIZE - 1) & PMD_MASK; + hend = end & PMD_MASK; + hflush = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hstart < hend;
if (type == FLUSH_TYPE_LOCAL) { asm volatile("ptesync": : :"memory");