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Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86/microcode: Use nonseekable_open()
  x86: Improve Intel microcode loader performance
This commit is contained in:
Linus Torvalds 2010-05-18 09:17:17 -07:00
commit d6f3875252
2 changed files with 18 additions and 8 deletions
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4
arch/x86/kernel/microcode_core.c
View File

@ -201,9 +201,9 @@ static int do_microcode_update(const void __user *buf, size_t size)
return error;
}
static int microcode_open(struct inode *unused1, struct file *unused2)
static int microcode_open(struct inode *inode, struct file *file)
{
return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM;
}
static ssize_t microcode_write(struct file *file, const char __user *buf,

22
arch/x86/kernel/microcode_intel.c
View File

@ -343,10 +343,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
int (*get_ucode_data)(void *, const void *, size_t))
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
u8 *ucode_ptr = data, *new_mc = NULL, *mc;
u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL;
int new_rev = uci->cpu_sig.rev;
unsigned int leftover = size;
enum ucode_state state = UCODE_OK;
unsigned int curr_mc_size = 0;
while (leftover) {
struct microcode_header_intel mc_header;
@ -361,9 +362,15 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
break;
}
mc = vmalloc(mc_size);
if (!mc)
break;
/* For performance reasons, reuse mc area when possible */
if (!mc || mc_size > curr_mc_size) {
if (mc)
vfree(mc);
mc = vmalloc(mc_size);
if (!mc)
break;
curr_mc_size = mc_size;
}
if (get_ucode_data(mc, ucode_ptr, mc_size) ||
microcode_sanity_check(mc) < 0) {
@ -376,13 +383,16 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
vfree(new_mc);
new_rev = mc_header.rev;
new_mc = mc;
} else
vfree(mc);
mc = NULL; /* trigger new vmalloc */
}
ucode_ptr += mc_size;
leftover -= mc_size;
}
if (mc)
vfree(mc);
if (leftover) {
if (new_mc)
vfree(new_mc);