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| author | Arnd Bergmann <arnd@arndb.de> | 2019-07-10 15:04:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 14:51:01 +0100 |
| commit | d5fe594a48b7530f79fae9c7e2b2ff4786c2a46c (patch) | |
| tree | 28685bc0e187796a06b73457d14b8bbd53bb9faf /include/linux/uwb | |
| parent | eb6e02ed98e8981e20e68c09c7b94439f5571d6b (diff) | |
x86/pgtable/32: Fix LOWMEM_PAGES constant
[ Upstream commit 26515699863d68058e290e18e83f444925920be5 ]
clang points out that the computation of LOWMEM_PAGES causes a signed
integer overflow on 32-bit x86:
arch/x86/kernel/head32.c:83:20: error: signed shift result (0x100000000) requires 34 bits to represent, but 'int' only has 32 bits [-Werror,-Wshift-overflow]
(PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT);
^~~~~~~~~~~~
arch/x86/include/asm/pgtable_32.h:109:27: note: expanded from macro 'LOWMEM_PAGES'
#define LOWMEM_PAGES ((((2<<31) - __PAGE_OFFSET) >> PAGE_SHIFT))
~^ ~~
arch/x86/include/asm/pgtable_32.h:98:34: note: expanded from macro 'PAGE_TABLE_SIZE'
#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
Use the _ULL() macro to make it a 64-bit constant.
Fixes: 1e620f9b23e5 ("x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190710130522.1802800-1-arnd@arndb.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux/uwb')
0 files changed, 0 insertions, 0 deletions