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| author |   Helge Deller <deller@gmx.de> | 2022-05-17 16:57:06 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2022-05-23 13:44:24 +0200 |
| commit | 44eeb9b56774c6f87155132a92252410e4610384 (patch) | |
| tree | b2ab546afabb7035902560023a09409b57ffbcb1 /arch/parisc/mm | |
| parent | parisc: Don't hardcode assembler bit definitions in tmpalias code (diff) | |
| download | linux-dev-44eeb9b56774c6f87155132a92252410e4610384.tar.xz linux-dev-44eeb9b56774c6f87155132a92252410e4610384.zip | |
parisc: Prevent ldil() to sign-extend into upper 32 bits
Add some build time checks to prevent that the various usages of
"ldil L%(TMPALIAS_MAP_START), %reg"
sign-extends into the upper 32 bits when building a 64-bit kernel.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/mm')
| -rw-r--r-- | arch/parisc/mm/init.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 1dc2e88e7b04..0a81499dd35e 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -555,6 +555,12 @@ void __init mem_init(void) BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD); #endif +#ifdef CONFIG_64BIT + /* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */ + BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000); + BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000); +#endif + high_memory = __va((max_pfn << PAGE_SHIFT)); set_max_mapnr(max_low_pfn); memblock_free_all(); |