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| author |   Arnd Bergmann <arnd@arndb.de> | 2017-01-11 15:49:04 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-01-12 09:40:06 +0100 |
| commit | c19a5f35e315837170ee337eed21c7087ea94192 (patch) | |
| tree | 762128ea67bd8fc860ce527cd29a5fceacb77e7e /arch/x86/kernel/e820.c | |
| parent | x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C (diff) | |
| download | wireguard-linux-c19a5f35e315837170ee337eed21c7087ea94192.tar.xz wireguard-linux-c19a5f35e315837170ee337eed21c7087ea94192.zip | |
x86/e820/32: Fix e820_search_gap() error handling on x86-32
GCC correctly points out that on 32-bit kernels, e820_search_gap()
not finding a start now leads to pci_mem_start ('gapstart') being set to an
uninitialized value:
arch/x86/kernel/e820.c: In function 'e820_setup_gap':
arch/x86/kernel/e820.c:641:16: error: 'gapstart' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This restores the behavior from before this cleanup:
b4ed1d15b453 ("x86/e820: Make e820_search_gap() static and remove unused variables")
... defaulting to address 0x10000000 if nothing was found.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Fixes: b4ed1d15b453 ("x86/e820: Make e820_search_gap() static and remove unused variables")
Link: http://lkml.kernel.org/r/20170111144926.695369-1-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/e820.c')
| -rw-r--r-- | arch/x86/kernel/e820.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 46f2afd3577a..b2bbad6ebe4d 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -626,14 +626,16 @@ __init void e820_setup_gap(void) gapsize = 0x400000; found = e820_search_gap(&gapstart, &gapsize); -#ifdef CONFIG_X86_64 if (!found) { +#ifdef CONFIG_X86_64 gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024; printk(KERN_ERR "e820: cannot find a gap in the 32bit address range\n" "e820: PCI devices with unassigned 32bit BARs may break!\n"); - } +#else + gapstart = 0x10000000; #endif + } /* * e820_reserve_resources_late protect stolen RAM already |