Hi Tom,
Le 10/05/2012 00:56, Tom Warren a écrit :
Albert,
-----Original Message-----
From: Albert ARIBAUD [mailto:albert.u.b...@aribaud.net]
Sent: Friday, May 04, 2012 12:28 PM
To: Simon Glass
Cc: U-Boot Mailing List; Tom Warren
Subject: Re: [U-Boot] [PATCH v6 03/23] Add abs() macro to return absolute
value
Hi Simon,
Le 04/05/2012 20:25, Simon Glass a écrit :
This macro is generally useful to make it available in common.
Signed-off-by: Simon Glass<s...@chromium.org>
---
Changes in v3:
- Add new patch to put abs() in common.h
Changes in v6:
- Update x86emu and omap4 to use the abs() macro
arch/arm/cpu/armv7/omap4/clocks.c | 2 --
drivers/bios_emulator/x86emu/prim_ops.c | 5 -----
include/common.h | 13 +++++++++++++
3 files changed, 13 insertions(+), 7 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap4/clocks.c
b/arch/arm/cpu/armv7/omap4/clocks.c
index e2189f7..ce3f59c 100644
--- a/arch/arm/cpu/armv7/omap4/clocks.c
+++ b/arch/arm/cpu/armv7/omap4/clocks.c
@@ -46,8 +46,6 @@
#define puts(s)
#endif
-#define abs(x) (((x)< 0) ? ((x)*-1) : (x))
-
struct omap4_prcm_regs *const prcm = (struct omap4_prcm_regs
*)0x4A004100;
const u32 sys_clk_array[8] = {
diff --git a/drivers/bios_emulator/x86emu/prim_ops.c
b/drivers/bios_emulator/x86emu/prim_ops.c
index 7553087..5f6c795 100644
--- a/drivers/bios_emulator/x86emu/prim_ops.c
+++ b/drivers/bios_emulator/x86emu/prim_ops.c
@@ -118,11 +118,6 @@ static u32 x86emu_parity_tab[8] =
#define PARITY(x) (((x86emu_parity_tab[(x) / 32]>> ((x) % 32))& 1)
== 0)
#define XOR2(x) (((x) ^ ((x)>>1))& 0x1)
-/*----------------------------- Implementation
----------------------------*/ -int abs(int v) -{
- return (v>0)?v:-v;
-}
/*----------------------------- Implementation
----------------------------*/
diff --git a/include/common.h b/include/common.h index
74d9704..92eac2c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -229,6 +229,19 @@ ulong timer_get_boot_us(void);
#define MIN(x, y) min(x, y)
#define MAX(x, y) max(x, y)
+/*
+ * Return the absolute value of a number. This handles unsigned ints,
+shorts
+ * and chars and returns a signed long.
+ */
What is the rationale for forcing a signed long return type? Such macros as
max, min, abs etc usually try to avoid any forced typing. Can't you get rid
of the ret variable and use __x directly as the return value?
+#define abs(x) ({ \
+ long ret; \
+ { \
+ typeof((x)) __x = (x); \
+ ret = (__x< 0) ? -__x : __x; \
+ } \
+ ret; \
+ })
+
#if defined(CONFIG_ENV_IS_EMBEDDED)
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#elif ( ((CONFIG_ENV_ADDR+CONFIG_ENV_SIZE)<
CONFIG_SYS_MONITOR_BASE) || \
This is the last fix needed to get my pull request to compile w/o
errors/warnings w/MAKEALL.
To get this unstuck, how about if I change the macro to:
#define abs(X) \
({ typeof (X) __x = (X); \
(__x< 0) ? -__x : __x; })
And put it locally in drivers/power/tps6586x.c (the only file that
uses it in that patchset). That way I get a clean build w/o the OMAP4
warnings of a double-defined abs(), and we can move everybody to use
abs() in include/common.h at a later date?
I don't have the final word on drivers/power :) but the best is you send
out a patch and if no one rejects it, then it should go in.
Tom
Amicalement,
--
Albert.
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