linux-kernel - [tip: x86/mm] x86/mm/pat: Simplify the free

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Date:   Fri, 10 Jan 2020 17:59:20 -0000
From:   "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/mm] x86/mm/pat: Simplify the free_memtype() control flow

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     47553d42c55f7b85e72ce6f3a18030102f8f93a3
Gitweb:        https://git.kernel.org/tip/47553d42c55f7b85e72ce6f3a18030102f8f93a3
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Tue, 19 Nov 2019 10:18:56 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 10 Dec 2019 10:12:55 +01:00

x86/mm/pat: Simplify the free_memtype() control flow

Simplify/streamline the quirky handling of the pat_pagerange_is_ram() logic,
and get rid of the 'err' local variable.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/pat.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index ea7da7e..af04992 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -656,7 +656,6 @@ int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,
 
 int free_memtype(u64 start, u64 end)
 {
-	int err = -EINVAL;
 	int is_range_ram;
 	struct memtype *entry;
 
@@ -671,14 +670,10 @@ int free_memtype(u64 start, u64 end)
 		return 0;
 
 	is_range_ram = pat_pagerange_is_ram(start, end);
-	if (is_range_ram == 1) {
-
-		err = free_ram_pages_type(start, end);
-
-		return err;
-	} else if (is_range_ram < 0) {
+	if (is_range_ram == 1)
+		return free_ram_pages_type(start, end);
+	if (is_range_ram < 0)
 		return -EINVAL;
-	}
 
 	spin_lock(&memtype_lock);
 	entry = memtype_erase(start, end);