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x86/mtrr: Convert to use match_string() helper

PATCH New Andy Shevchenko 2 participants 2 messages May 15, 2018 – May 16, 2018 x86

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Andy Shevchenko

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#0 lore raw

PATCH v2 1/1 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.

Signed-off-by Andy Shevchenko <[email protected]>

---

- reword commit message

 arch/x86/kernel/cpu/mtrr/if.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)
arch/x86/kernel/cpu/mtrr/if.c +10 -11
index d0fd1a5a098e..3cbae60663fa 100644
@@ -137,17 +137,16 @@ 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
Signature · 1 line
2.17.0
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#1 lore raw
x86/mtrr: Convert to use match_string() helper
Commit-ID:  13a4db9d75ec5dbca4bd6229e149e061ef7a6bf0
Gitweb:     https://git.kernel.org/tip/13a4db9d75ec5dbca4bd6229e149e061ef7a6bf0
Author:     Andy Shevchenko <[email protected]>
AuthorDate: Tue, 15 May 2018 20:57:59 +0300
Committer:  Ingo Molnar <[email protected]>
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 <[email protected]>
Cc Andrew Morton <[email protected]>
Cc Andy Lutomirski <[email protected]>
Cc Borislav Petkov <[email protected]>
Cc Brian Gerst <[email protected]>
Cc Denys Vlasenko <[email protected]>
Cc H. Peter Anvin <[email protected]>
Cc Josh Poimboeuf <[email protected]>
Cc Linus Torvalds <[email protected]>
Cc Luis R. Rodriguez <[email protected]>
Cc Peter Zijlstra <[email protected]>
Cc Thomas Gleixner <[email protected]>
Cc Toshi Kani <[email protected]>
Link http://lkml.kernel.org/r/[email protected] open here
Signed-off-by Ingo Molnar <[email protected]>
---
 arch/x86/kernel/cpu/mtrr/if.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)
arch/x86/kernel/cpu/mtrr/if.c +10 -11
index 558444b23923..42b4f2f3b557 100644
@@ -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