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| author | Alex Thorlton <athorlton@sgi.com> | 2016-12-05 11:49:13 -0600 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2016-12-09 10:59:04 +0100 |
| commit | 9d2f86c6cad5a8a3f0b38a80136ba68364ca7278 (patch) | |
| tree | 006d4ed0a80b362461b463272b72c16e92377257 /arch/x86 | |
| parent | 577f79e411b7a81a8ae7ae4daf5d4056ebbfbc58 (diff) | |
| download | linux-9d2f86c6cad5a8a3f0b38a80136ba68364ca7278.tar.bz2 | |
x86: Make E820_X_MAX unconditionally larger than E820MAX
It's really not necessary to limit E820_X_MAX to 128 in the non-EFI
case. This commit drops E820_X_MAX's dependency on CONFIG_EFI, so that
E820_X_MAX is always at least slightly larger than E820MAX.
The real motivation behind this is actually to prevent some issues in
the Xen kernel, where the XENMEM_machine_memory_map hypercall can
produce an e820 map larger than 128 entries, even on systems where the
original e820 table was quite a bit smaller than that, depending on how
many IOAPICs are installed on the system.
Signed-off-by: Alex Thorlton <athorlton@sgi.com>
Suggested-by: Ingo Molnar <mingo@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/e820.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index 476b574de99e..ec23d8e1297c 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -1,13 +1,17 @@ #ifndef _ASM_X86_E820_H #define _ASM_X86_E820_H -#ifdef CONFIG_EFI +/* + * E820_X_MAX is the maximum size of the extended E820 table. The extended + * table may contain up to 3 extra E820 entries per possible NUMA node, so we + * make room for 3 * MAX_NUMNODES possible entries, beyond the standard 128. + * Also note that E820_X_MAX *must* be defined before we include uapi/asm/e820.h. + */ #include <linux/numa.h> #define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES) -#else /* ! CONFIG_EFI */ -#define E820_X_MAX E820MAX -#endif + #include <uapi/asm/e820.h> + #ifndef __ASSEMBLY__ /* see comment in arch/x86/kernel/e820.c */ extern struct e820map *e820; |