linux-kernel - Re: [PATCH v3] fsl-ifc: add missing include on ARM64

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Date:	Tue, 13 Oct 2015 03:45:50 +0000
From:	Lijun Pan <Lijun.Pan@...escale.com>
To:	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] fsl-ifc: add missing include on ARM64

Dear Arnd,

I would like to have your feedback on this patch.
If it is good now, can you accept it?  
Lijun




On 10/1/15, 4:14 PM, "Lijun Pan" <Lijun.Pan@...escale.com> wrote:

>Need to include sched.h to fix the following compilation error
>if FSL_IFC is enabled on ARM64 machine.
>
>In file included from include/linux/mmzone.h:9:0,
>                 from include/linux/gfp.h:5,
>                 from include/linux/kmod.h:22,
>                 from include/linux/module.h:13,
>                 from drivers/memory/fsl_ifc.c:22:
>drivers/memory/fsl_ifc.c: In function ‘check_nand_stat’:
>include/linux/wait.h:165:35: error: ‘TASK_NORMAL’ undeclared (first use in this function)
> #define wake_up(x)   __wake_up(x, TASK_NORMAL, 1, NULL)
>                                   ^
>drivers/memory/fsl_ifc.c:136:3: note: in expansion of macro ‘wake_up’
>   wake_up(&ctrl->nand_wait);
>   ^
>include/linux/wait.h:165:35: note: each undeclared identifier is reported only once for each function it appears in
> #define wake_up(x)   __wake_up(x, TASK_NORMAL, 1, NULL)
>                                   ^
>drivers/memory/fsl_ifc.c:136:3: note: in expansion of macro ‘wake_up’
>   wake_up(&ctrl->nand_wait);
>   ^
>
>Analysis is as follows:
>I put some instrumental code and get the
>following .h files inclusion sequence:
>
>In file included from ./arch/arm64/include/asm/compat.h:25:0,
>                 from ./arch/arm64/include/asm/stat.h:23,
>                 from include/linux/stat.h:5,
>                 from include/linux/module.h:10,
>                 from drivers/memory/fsl_ifc.c:23:
>include/linux/sched.h:113:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘struct’
> struct sched_attr {
> ^
>
>CONFIG_COMPAT=y is enabled while 39 and 48 bit VA is selected.
>When 42 bit VA is selected, it does not enable CONFIG_COMPAT=y
>
>In ./arch/arm64/include/asm/stat.h:23, it has
>"#ifdef CONFIG_COMPAT"
>"#include <asm/compat.h>"
>"..."
>"#endif"
>
>Since ./arch/arm64/include/asm/stat.h does not
>include ./arch/arm64/include/asm/compat.h,
>then it will not include include/linux/sched.h
>Hence we have to manually add "#include <linux/sched.h>"
>in drivers/memory/fsl_ifc.c
>
>Signed-off-by: Lijun Pan <Lijun.Pan@...escale.com>
>---
>v3: change the subject title to better reflect the commit message
>    insert linux/sched.h in more appropriate place among all .h files
>    articulate CONFIG_COMPAT=y is set in 39/48 bit VA
>v2: reordering the include .h files according to Arnd's suggestion
>    detailing why linux/sched.h is needed.
>
> drivers/memory/fsl_ifc.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/drivers/memory/fsl_ifc.c b/drivers/memory/fsl_ifc.c
>index e87459f..acd1460 100644
>--- a/drivers/memory/fsl_ifc.c
>+++ b/drivers/memory/fsl_ifc.c
>@@ -22,6 +22,7 @@
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/compiler.h>
>+#include <linux/sched.h>
> #include <linux/spinlock.h>
> #include <linux/types.h>
> #include <linux/slab.h>
>-- 
>2.3.3
>