On Tue, Jan 12, 2021 at 10:48:32PM +0000, Will Deacon wrote: > GCC versions >= 4.9 and < 5.1 have been shown to emit memory references > beyond the stack pointer, resulting in memory corruption if an interrupt > is taken after the stack pointer has been adjusted but before the > reference has been executed. This leads to subtle, infrequent data > corruption such as the EXT4 problems reported by Russell King at the > link below. > > Life is too short for buggy compilers, so raise the minimum GCC version > required by arm64 to 5.1. > > Cc: Theodore Ts'o <ty...@mit.edu> > Cc: Catalin Marinas <catalin.mari...@arm.com> > Cc: Florian Weimer <fwei...@redhat.com> > Cc: Peter Zijlstra <pet...@infradead.org> > Cc: Linus Torvalds <torva...@linux-foundation.org> > Cc: Nick Desaulniers <ndesaulni...@google.com> > Reported-by: Russell King <li...@armlinux.org.uk> > Suggested-by: Arnd Bergmann <a...@kernel.org> > Link: https://lore.kernel.org/r/20210105154726.gd1...@shell.armlinux.org.uk > Signed-off-by: Will Deacon <w...@kernel.org>
Reviewed-by: Nathan Chancellor <natechancel...@gmail.com> Tested-by: Nathan Chancellor <natechancel...@gmail.com> > --- > include/linux/compiler-gcc.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h > index 74c6c0486eed..555ab0fddbef 100644 > --- a/include/linux/compiler-gcc.h > +++ b/include/linux/compiler-gcc.h > @@ -13,6 +13,12 @@ > /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */ > #if GCC_VERSION < 40900 > # error Sorry, your version of GCC is too old - please use 4.9 or newer. > +#elif defined(CONFIG_ARM64) && GCC_VERSION < 50100 > +/* > + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293 > + * https://lore.kernel.org/r/20210107111841.gn1...@shell.armlinux.org.uk > + */ > +# error Sorry, your version of GCC is too old - please use 5.1 or newer. > #endif > > /* > -- > 2.30.0.284.gd98b1dd5eaa7-goog >