e84ff42500
This patch fixes crash_dump.c build error. Build error logs are as follow. arch/mips/kernel/crash_dump.c: In function 'kdump_buf_page_init': arch/mips/kernel/crash_dump.c:67: error: implicit declaration of function 'kmalloc' arch/mips/kernel/crash_dump.c:67: error: assignment makes pointer from integer without a cast Signed-off-by: EunBong Song <eunb.song@samsung.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/5238/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#include <linux/highmem.h>
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#include <linux/bootmem.h>
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#include <linux/crash_dump.h>
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#include <asm/uaccess.h>
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#include <linux/slab.h>
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static int __init parse_savemaxmem(char *p)
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{
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if (p)
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saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
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return 1;
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}
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__setup("savemaxmem=", parse_savemaxmem);
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static void *kdump_buf_page;
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel.
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*
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* Calling copy_to_user() in atomic context is not desirable. Hence first
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* copying the data to a pre-allocated kernel page and then copying to user
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* space in non-atomic context.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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{
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void *vaddr;
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if (!csize)
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return 0;
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vaddr = kmap_atomic_pfn(pfn);
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if (!userbuf) {
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memcpy(buf, (vaddr + offset), csize);
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kunmap_atomic(vaddr);
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} else {
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if (!kdump_buf_page) {
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pr_warning("Kdump: Kdump buffer page not allocated\n");
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return -EFAULT;
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}
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copy_page(kdump_buf_page, vaddr);
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kunmap_atomic(vaddr);
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if (copy_to_user(buf, (kdump_buf_page + offset), csize))
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return -EFAULT;
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}
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return csize;
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}
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static int __init kdump_buf_page_init(void)
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{
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int ret = 0;
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kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!kdump_buf_page) {
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pr_warning("Kdump: Failed to allocate kdump buffer page\n");
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ret = -ENOMEM;
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}
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return ret;
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}
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arch_initcall(kdump_buf_page_init);
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