linux-kernel - [patch V2 19/36] net: vxge: Remove in

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Message-Id: <20200929203501.384359804@linutronix.de>
Date:   Tue, 29 Sep 2020 22:25:28 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Paul McKenney <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
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        Govindarajulu Varadarajan <_govind@....com>,
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        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
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Subject: [patch V2 19/36] net: vxge: Remove in_interrupt() conditionals

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

vxge_os_dma_malloc() and vxge_os_dma_malloc_async() are both called from
callchains which use GFP_KERNEL allocations unconditionally or have other
requirements to be called from fully preemptible task context..

vxge_os_dma_malloc():
  1)  __vxge_hw_blockpool_create() <- GFP_KERNEL
	
  2)  __vxge_hw_mempool_grow() <- vzalloc()
        __vxge_hw_blockpool_malloc()

vxge_os_dma_malloc_async():
  1  __vxge_hw_mempool_grow() <- vzalloc()
      __vxge_hw_blockpool_malloc()
	__vxge_hw_blockpool_blocks_add()

  2)  vxge_hw_vpath_open()	<- vzalloc()
	__vxge_hw_blockpool_block_allocate()

That means neither of these functions needs a conditional allocation mode.

Remove the in_interrupt() conditional and use GFP_KERNEL.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>


---
 drivers/net/ethernet/neterion/vxge/vxge-config.c |    9 +--------
 drivers/net/ethernet/neterion/vxge/vxge-config.h |    7 +------
 2 files changed, 2 insertions(+), 14 deletions(-)

--- a/drivers/net/ethernet/neterion/vxge/vxge-config.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-config.c
@@ -2303,16 +2303,9 @@ static void vxge_hw_blockpool_block_add(
 static inline void
 vxge_os_dma_malloc_async(struct pci_dev *pdev, void *devh, unsigned long size)
 {
-	gfp_t flags;
 	void *vaddr;
 
-	if (in_interrupt())
-		flags = GFP_ATOMIC | GFP_DMA;
-	else
-		flags = GFP_KERNEL | GFP_DMA;
-
-	vaddr = kmalloc((size), flags);
-
+	vaddr = kmalloc(size, GFP_KERNEL | GFP_DMA);
 	vxge_hw_blockpool_block_add(devh, vaddr, size, pdev, pdev);
 }
 
--- a/drivers/net/ethernet/neterion/vxge/vxge-config.h
+++ b/drivers/net/ethernet/neterion/vxge/vxge-config.h
@@ -1899,18 +1899,13 @@ static inline void *vxge_os_dma_malloc(s
 			struct pci_dev **p_dmah,
 			struct pci_dev **p_dma_acch)
 {
-	gfp_t flags;
 	void *vaddr;
 	unsigned long misaligned = 0;
 	int realloc_flag = 0;
 	*p_dma_acch = *p_dmah = NULL;
 
-	if (in_interrupt())
-		flags = GFP_ATOMIC | GFP_DMA;
-	else
-		flags = GFP_KERNEL | GFP_DMA;
 realloc:
-	vaddr = kmalloc((size), flags);
+	vaddr = kmalloc(size, GFP_KERNEL | GFP_DMA);
 	if (vaddr == NULL)
 		return vaddr;
 	misaligned = (unsigned long)VXGE_ALIGN((unsigned long)vaddr,