linux-kernel - [PATCH 3.16 22/83] asm-generic: fix -Wtype-limits compiler warnings

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Message-ID: <lsq.1574264230.399102358@decadent.org.uk>
Date:   Wed, 20 Nov 2019 15:37:32 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        "James Y Knight" <jyknight@...gle.com>,
        "Nathan Chancellor" <natechancellor@...il.com>,
        "Arnd Bergmann" <arnd@...db.de>,
        "Bill Wendling" <morbo@...gle.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Jakub Jelinek" <jakub@...hat.com>,
        "David Howells" <dhowells@...hat.com>, "Qian Cai" <cai@....pw>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 22/83] asm-generic: fix -Wtype-limits compiler warnings

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Qian Cai <cai@....pw>

commit cbedfe11347fe418621bd188d58a206beb676218 upstream.

Commit d66acc39c7ce ("bitops: Optimise get_order()") introduced a
compilation warning because "rx_frag_size" is an "ushort" while
PAGE_SHIFT here is 16.

The commit changed the get_order() to be a multi-line macro where
compilers insist to check all statements in the macro even when
__builtin_constant_p(rx_frag_size) will return false as "rx_frag_size"
is a module parameter.

In file included from ./arch/powerpc/include/asm/page_64.h:107,
                 from ./arch/powerpc/include/asm/page.h:242,
                 from ./arch/powerpc/include/asm/mmu.h:132,
                 from ./arch/powerpc/include/asm/lppaca.h:47,
                 from ./arch/powerpc/include/asm/paca.h:17,
                 from ./arch/powerpc/include/asm/current.h:13,
                 from ./include/linux/thread_info.h:21,
                 from ./arch/powerpc/include/asm/processor.h:39,
                 from ./include/linux/prefetch.h:15,
                 from drivers/net/ethernet/emulex/benet/be_main.c:14:
drivers/net/ethernet/emulex/benet/be_main.c: In function 'be_rx_cqs_create':
./include/asm-generic/getorder.h:54:9: warning: comparison is always
true due to limited range of data type [-Wtype-limits]
   (((n) < (1UL << PAGE_SHIFT)) ? 0 :  \
         ^
drivers/net/ethernet/emulex/benet/be_main.c:3138:33: note: in expansion
of macro 'get_order'
  adapter->big_page_size = (1 << get_order(rx_frag_size)) * PAGE_SIZE;
                                 ^~~~~~~~~

Fix it by moving all of this multi-line macro into a proper function,
and killing __get_order() off.

[akpm@...ux-foundation.org: remove __get_order() altogether]
[cai@....pw: v2]
  Link: http://lkml.kernel.org/r/1564000166-31428-1-git-send-email-cai@lca.pw
Link: http://lkml.kernel.org/r/1563914986-26502-1-git-send-email-cai@lca.pw
Fixes: d66acc39c7ce ("bitops: Optimise get_order()")
Signed-off-by: Qian Cai <cai@....pw>
Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: David Howells <dhowells@...hat.com>
Cc: Jakub Jelinek <jakub@...hat.com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Bill Wendling <morbo@...gle.com>
Cc: James Y Knight <jyknight@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/asm-generic/getorder.h | 50 ++++++++++++++--------------------
 1 file changed, 20 insertions(+), 30 deletions(-)

--- a/include/asm-generic/getorder.h
+++ b/include/asm-generic/getorder.h
@@ -6,24 +6,6 @@
 #include <linux/compiler.h>
 #include <linux/log2.h>
 
-/*
- * Runtime evaluation of get_order()
- */
-static inline __attribute_const__
-int __get_order(unsigned long size)
-{
-	int order;
-
-	size--;
-	size >>= PAGE_SHIFT;
-#if BITS_PER_LONG == 32
-	order = fls(size);
-#else
-	order = fls64(size);
-#endif
-	return order;
-}
-
 /**
  * get_order - Determine the allocation order of a memory size
  * @size: The size for which to get the order
@@ -42,19 +24,27 @@ int __get_order(unsigned long size)
  * to hold an object of the specified size.
  *
  * The result is undefined if the size is 0.
- *
- * This function may be used to initialise variables with compile time
- * evaluations of constants.
  */
-#define get_order(n)						\
-(								\
-	__builtin_constant_p(n) ? (				\
-		((n) == 0UL) ? BITS_PER_LONG - PAGE_SHIFT :	\
-		(((n) < (1UL << PAGE_SHIFT)) ? 0 :		\
-		 ilog2((n) - 1) - PAGE_SHIFT + 1)		\
-	) :							\
-	__get_order(n)						\
-)
+static inline __attribute_const__ int get_order(unsigned long size)
+{
+	if (__builtin_constant_p(size)) {
+		if (!size)
+			return BITS_PER_LONG - PAGE_SHIFT;
+
+		if (size < (1UL << PAGE_SHIFT))
+			return 0;
+
+		return ilog2((size) - 1) - PAGE_SHIFT + 1;
+	}
+
+	size--;
+	size >>= PAGE_SHIFT;
+#if BITS_PER_LONG == 32
+	return fls(size);
+#else
+	return fls64(size);
+#endif
+}
 
 #endif	/* __ASSEMBLY__ */