linux-kernel - Re: [PATCH] memblock: Add limit checking to memblock_virt

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Date:	Wed, 29 Jan 2014 16:34:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memblock: Add limit checking to memblock_virt_alloc

On Wed, 29 Jan 2014 16:12:13 -0800 Tony Luck <tony.luck@...il.com> wrote:

> Applying on top of Linus' tree (commit =
> dda68a8c1707b4011dc3c656fa1b2c6de6f7f304) I just get:
> 
> patching file include/linux/bootmem.h
> Hunk #1 FAILED at 264.
> Hunk #2 FAILED at 272.
> 2 out of 2 hunks FAILED -- saving rejects to file include/linux/bootmem.h.rej
> 
> - not a promising start :-(
> 

It applies for me.  MIME getting you down?


From: Yinghai Lu <yinghai@...nel.org>
Subject: memblock, bootmem: restore goal for alloc_low

Now we have memblock_virt_alloc_low to replace original bootmem api
in swiotlb.

But we should not use BOOTMEM_LOW_LIMIT for arch that does not support
CONFIG_NOBOOTMEM, as old api take 0.

| #define alloc_bootmem_low(x) \
|        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
|#define alloc_bootmem_low_pages_nopanic(x) \
|        __alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)

and we have
 #define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
for CONFIG_NOBOOTMEM.

Restore goal to 0 to fix ia64 crash, that Tony found.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Reported-by: Tony Luck <tony.luck@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/linux/bootmem.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN include/linux/bootmem.h~memblock-bootmem-restore-goal-for-alloc_low include/linux/bootmem.h
--- a/include/linux/bootmem.h~memblock-bootmem-restore-goal-for-alloc_low
+++ a/include/linux/bootmem.h
@@ -264,7 +264,7 @@ static inline void * __init memblock_vir
 {
 	if (!align)
 		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_low(size, align, BOOTMEM_LOW_LIMIT);
+	return __alloc_bootmem_low(size, align, 0);
 }
 
 static inline void * __init memblock_virt_alloc_low_nopanic(
@@ -272,7 +272,7 @@ static inline void * __init memblock_vir
 {
 	if (!align)
 		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_low_nopanic(size, align, BOOTMEM_LOW_LIMIT);
+	return __alloc_bootmem_low_nopanic(size, align, 0);
 }
 
 static inline void * __init memblock_virt_alloc_from_nopanic(
_

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