Mark Salter
6b0f68e32e
mm: add utility for early copy from unmapped ram ...
When booting an arm64 kernel w/initrd using UEFI/grub, use of mem= will
likely cut off part or all of the initrd. This leaves it outside the
kernel linear map which leads to failure when unpacking. The x86 code
has a similar need to relocate an initrd outside of mapped memory in
some cases.
The current x86 code uses early_memremap() to copy the original initrd
from unmapped to mapped RAM. This patchset creates a generic
copy_from_early_mem() utility based on that x86 code and has arm64 and
x86 share it in their respective initrd relocation code.
This patch (of 3):
In some early boot circumstances, it may be necessary to copy from RAM
outside the kernel linear mapping to mapped RAM. The need to relocate
an initrd is one example in the x86 code. This patch creates a helper
function based on current x86 code.
Signed-off-by: Mark Salter <msalter@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-08 15:35:28 -07:00
arch: Mass conversion of smp_mb__*()
2014-04-18 14:20:48 +02:00
mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h>
2015-02-11 17:06:03 -08:00
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
locking, asm-generic: Add _{relaxed|acquire|release}() variants for 'atomic_long_t'
2015-08-12 11:59:01 +02:00
atomic: Collapse all atomic_{set,clear}_mask definitions
2015-07-27 14:06:24 +02:00
atomic: Provide atomic_{or,xor,and}
2015-07-27 14:06:24 +02:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
locking, arch: use WRITE_ONCE()/READ_ONCE() in smp_store_release()/smp_load_acquire()
2015-08-03 10:59:30 +02:00
arch: Prepare for smp_mb__{before,after}_atomic()
2014-04-18 11:40:30 +02:00
bug: Make BUG() always stop the machine
2014-04-07 16:36:10 -07:00
asm-generic: COMMON_CLK defines __clk_{get,put}
2014-09-25 18:00:45 -07:00
LLVMLinux: Remove warning about returning an uninitialized variable
2014-04-09 13:44:35 -07:00
locking/rtmutex: Drop usage of __HAVE_ARCH_CMPXCHG
2015-05-13 10:51:28 +02:00
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
DMA-API: Change dma_declare_coherent_memory() CPU address to phys_addr_t
2014-05-20 16:55:23 -06:00
asm-generic: Add dma-contiguous.h
2014-09-22 13:35:51 +02:00
asm/dma-mapping-common: Clarify output of dma_map_sg_attrs
2015-03-09 13:05:47 +01:00
mm: add utility for early copy from unmapped ram
2015-09-08 15:35:28 -07:00
arm64: fixmap: fix missing sub-page offset for earlyprintk
2014-05-03 22:20:31 +01:00
sched/preempt, futex: Disable preemption in UP futex_atomic_cmpxchg_inatomic() explicitly
2015-05-19 08:39:16 +02:00
gpio: remove gpiod_sysfs_set_active_low
2015-05-12 10:46:53 +02:00
mm: Fix generic hugetlb pte check return type.
2013-10-02 20:02:35 -04:00
readq/writeq: Add explicit lo_hi_[read|write]_q and hi_lo_[read|write]_q
2014-07-04 13:27:30 +02:00
readq/writeq: Add explicit lo_hi_[read|write]_q and hi_lo_[read|write]_q
2014-07-04 13:27:30 +02:00
x86/mm, asm-generic: Add IOMMU ioremap_uc() variant default
2015-07-21 10:47:03 +02:00
include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
2014-06-06 16:08:13 -07:00
x86/mm, asm-generic: Add ioremap_wt() for creating Write-Through mappings
2015-06-07 15:28:56 +02:00
irq_work: Introduce arch_irq_work_has_interrupt()
2014-09-13 18:38:07 +02:00
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
__page_to_pfn: Fix typo in comment
2013-10-14 15:28:29 +02:00
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mm: Make arch_unmap()/bprm_mm_init() available to all architectures
2014-11-19 11:54:13 +01:00
asm-generic: Remove asm-generic arch_bprm_mm_init()
2014-11-22 21:52:08 +01:00
asm-generic: Add msi.h
2014-11-23 13:01:47 +01:00
pci-dma-compat: add pci_zalloc_consistent helper
2014-08-08 15:57:28 -07:00
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
percpu: preffity percpu header files
2014-06-17 19:12:40 -04:00
mm: clarify that the function operates on hugepage pte
2015-06-24 17:49:44 -07:00
sched/preempt: Fix cond_resched_lock() and cond_resched_softirq()
2015-08-03 12:21:24 +02:00
locking/qrwlock: Make use of _{acquire|release|relaxed}() atomics
2015-08-12 11:59:06 +02:00
locking/rwlocks: Introduce 'qrwlocks' - fair, queued rwlocks
2014-06-06 07:58:28 +02:00
locking/qspinlock: Revert to test-and-set on hypervisors
2015-05-08 12:36:58 +02:00
locking/qspinlock: Optimize for smaller NR_CPUS
2015-05-08 12:36:48 +02:00
asm-generic: remove _STK_LIM_MAX
2014-05-15 00:32:09 +01:00
asm-generic: rwsem: de-PPCify rwsem.h
2014-03-14 18:02:08 +00:00
seccomp: allow COMPAT sigreturn overrides
2015-04-17 09:04:09 -04:00
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
2014-10-09 22:26:04 -04:00
constify copy_siginfo_to_user{,32}()
2013-11-09 00:16:29 -05:00
crypto: create generic version of ablk_helper
2013-09-24 06:02:24 +10:00
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
mm: mmu_gather: use tlb->end != 0 only for TLB invalidation
2015-01-13 15:20:40 +13:00
asm-generic: uaccess: Spelling s/a ny/any/
2014-01-02 10:45:23 +01:00
asm-generic: allow generic unaligned access if the arch supports it
2014-05-08 10:22:23 +02:00
TTY/Serial patches for 4.1-rc1
2015-04-21 09:33:10 -07:00
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
word-at-a-time: simplify big-endian zero_bytemask macro
2014-05-01 08:57:44 -07:00
6b0f68e32e