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Subject[tip:x86/mm] x86/mtrr: Convert to use match_string() helper
Commit-ID:  13a4db9d75ec5dbca4bd6229e149e061ef7a6bf0
Gitweb: https://git.kernel.org/tip/13a4db9d75ec5dbca4bd6229e149e061ef7a6bf0
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
AuthorDate: Tue, 15 May 2018 20:57:59 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 16 May 2018 09:47:22 +0200

x86/mtrr: Convert to use match_string() helper

The helper returns index of the matching string in an array.
Replace the open coded array lookup with match_string().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Link: http://lkml.kernel.org/r/20180515175759.89315-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/mtrr/if.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 558444b23923..42b4f2f3b557 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -149,17 +149,16 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
return -EINVAL;
ptr = skip_spaces(ptr + 5);

- for (i = 0; i < MTRR_NUM_TYPES; ++i) {
- if (strcmp(ptr, mtrr_strings[i]))
- continue;
- base >>= PAGE_SHIFT;
- size >>= PAGE_SHIFT;
- err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
- if (err < 0)
- return err;
- return len;
- }
- return -EINVAL;
+ i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
+ if (i < 0)
+ return i;
+
+ base >>= PAGE_SHIFT;
+ size >>= PAGE_SHIFT;
+ err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
+ if (err < 0)
+ return err;
+ return len;
}

static long
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