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/linux/Documentation/core-api/
H A Dunaligned-memory-access.rst15 unaligned accesses, why you need to write code that doesn't cause them,
19 The definition of an unaligned access
25 reading 4 bytes of data from address 0x10005 would be an unaligned memory
52 Why unaligned access is bad
55 The effects of performing an unaligned memory access vary from architecture
59 - Some architectures are able to perform unaligned memory accesses
61 - Some architectures raise processor exceptions when unaligned accesses
62 happen. The exception handler is able to correct the unaligned access,
64 - Some architectures raise processor exceptions when unaligned accesses
66 unaligned access to be corrected.
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/linux/Documentation/arch/arm/
H A Dmem_alignment.rst14 unaligned memory access in general. If those access are predictable, you
15 are better to use the macros provided by include/linux/unaligned.h. The
20 trap to SIGBUS any code performing unaligned access (good for debugging bad
27 real bad - it changes the behaviour of all unaligned instructions in user
36 0 A user process performing an unaligned memory access
42 performing the unaligned access. This is of course
47 performing the unaligned access.
59 information on unaligned access occurrences plus the current mode of
/linux/net/xdp/
H A Dxsk_buff_pool.c62 bool unaligned = umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG; in xp_create_and_assign_umem() local
67 entries = unaligned ? umem->chunks : 0; in xp_create_and_assign_umem()
87 pool->unaligned = unaligned; in xp_create_and_assign_umem()
111 if (pool->unaligned) in xp_create_and_assign_umem()
444 if (!pool->unaligned) { in xp_init_dma_info()
501 if (pool->unaligned) in xp_dma_map()
540 if (pool->unaligned) { in xp_get_xskb()
567 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : in __xp_alloc()
627 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : in xp_alloc_new_from_fq()
735 return pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; in __xp_raw_get_addr()
/linux/Documentation/devicetree/bindings/pci/
H A Dti-pci.txt36 - ti,syscon-unaligned-access: phandle to the syscon DT node. The 1st argument
39 for setting the bit to enable unaligned
54 - ti,syscon-unaligned-access: phandle to the syscon DT node. The 1st argument
57 for setting the bit to enable unaligned
/linux/arch/riscv/
H A DKconfig962 bool "Request firmware delegation of unaligned access exceptions"
977 Saying N here will not worsen emulation support for unaligned accesses
987 This determines the level of support for unaligned accesses. This
993 bool "Probe for hardware unaligned access support"
997 speed of unaligned accesses. This probing will dynamically determine
998 the speed of unaligned accesses on the underlying system. If unaligned
1000 system, the kernel will emulate the unaligned accesses to preserve the
1004 bool "Emulate unaligned access where system support is missing"
1007 If unaligned memor
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/linux/drivers/s390/cio/
H A Dvfio_ccw_cp.c92 struct vfio_device *vdev, int pa_nr, bool unaligned) in page_array_unpin() argument
102 !unaligned) { in page_array_unpin()
131 static int page_array_pin(struct page_array *pa, struct vfio_device *vdev, bool unaligned) in page_array_pin() argument
142 !unaligned) { in page_array_pin()
164 page_array_unpin(pa, vdev, pinned, unaligned); in page_array_pin()
169 static void page_array_unpin_free(struct page_array *pa, struct vfio_device *vdev, bool unaligned) in page_array_unpin_free() argument
171 page_array_unpin(pa, vdev, pa->pa_nr, unaligned); in page_array_unpin_free()
/linux/arch/alpha/kernel/
H A Dsetup.c1048 } unaligned[2]; in show_cpuinfo()
1111 unaligned[0].count, unaligned[0].pc, unaligned[0].va, in show_cpuinfo()
1112 unaligned[1].count, unaligned[1].pc, unaligned[1].va, in show_cpuinfo()
/linux/include/net/
H A Dxsk_buff_pool.h88 bool unaligned; member
228 if (xskb->pool->unaligned) in xp_release()
238 if (!pool->unaligned) in xp_get_handle()
/linux/Documentation/translations/zh_CN/core-api/
H A Dunaligned-memory-access.rst3 :Original: Documentation/core-api/unaligned-memory-access.rst
178 避免非对齐访问的最简单方法是使用<linux/unaligned.h>头文件提供的get_unaligned()和
H A Dindex.rst111 unaligned-memory-access
/linux/drivers/spi/
H A Dspi-imx.c379 int unaligned; in spi_imx_buf_rx_swap() local
382 unaligned = spi_imx->remainder % 4; in spi_imx_buf_rx_swap()
384 if (!unaligned) { in spi_imx_buf_rx_swap()
396 while (unaligned--) { in spi_imx_buf_rx_swap()
398 *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff; in spi_imx_buf_rx_swap()
431 int unaligned; in spi_imx_buf_tx_swap() local
434 unaligned = spi_imx->count % 4; in spi_imx_buf_tx_swap()
436 if (!unaligned) { in spi_imx_buf_tx_swap()
446 while (unaligned--) { in spi_imx_buf_tx_swap()
448 val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned); in spi_imx_buf_tx_swap()
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/linux/Documentation/dev-tools/
H A Dubsan.rst68 Detection of unaligned accesses controlled through the separate option -
70 unaligned accesses (CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y). One could
/linux/arch/parisc/boot/compressed/
H A Dvmlinux.scr7 output_len = . - 4; /* can be at unaligned address */
/linux/rust/zerocopy-derive/
H A Dlib.rs127 derive!(Unaligned => derive_unaligned => crate::derive::unaligned::derive_unaligned);
149 (crate::derive::unaligned::derive_unaligned, Trait::Unaligned), in most_traits()
/linux/arch/arc/lib/
H A Dmemcpy-archs.S94 ;;; CASE 1: The source is unaligned, off by 1
139 ;;; CASE 2: The source is unaligned, off by 2
180 ;;; CASE 3: The source is unaligned, off by 3
H A DMakefile12 lib-$(CONFIG_ISA_ARCV2) +=memcpy-archs-unaligned.o
H A Dstrchr-700.S41 breq r7,0,.Loop ; For speed, we want this branch to be unaligned.
45 breq r12,0,.Loop ; For speed, we want this branch to be unaligned.
/linux/arch/loongarch/lib/
H A DMakefile6 lib-y += delay.o clear_user.o copy_user.o dump_tlb.o unaligned.o
/linux/arch/riscv/kernel/
H A DMakefile80 obj-$(CONFIG_RISCV_PROBE_UNALIGNED_ACCESS) += copy-unaligned.o
81 obj-$(CONFIG_RISCV_PROBE_VECTOR_UNALIGNED_ACCESS) += vec-copy-unaligned.o
/linux/arch/loongarch/kernel/
H A Dmodule.c216 goto unaligned; in apply_r_larch_sop_imm_field()
231 goto unaligned; in apply_r_larch_sop_imm_field()
242 goto unaligned; in apply_r_larch_sop_imm_field()
268 unaligned: in apply_r_larch_sop_imm_field()
/linux/arch/powerpc/include/asm/
H A Demulated_ops.h35 struct ppc_emulated_entry unaligned; member
/linux/arch/arc/kernel/
H A DMakefile18 obj-$(CONFIG_ARC_EMUL_UNALIGNED) += unaligned.o
/linux/Documentation/translations/zh_CN/process/
H A Dindex.rst87 ../core-api/unaligned-memory-access
/linux/lib/crypto/arm/
H A Dsha1-armv4-large.S93 ldr r9,[r1],#4 @ handles unaligned
118 ldr r9,[r1],#4 @ handles unaligned
143 ldr r9,[r1],#4 @ handles unaligned
168 ldr r9,[r1],#4 @ handles unaligned
193 ldr r9,[r1],#4 @ handles unaligned
221 ldr r9,[r1],#4 @ handles unaligned
/linux/drivers/net/ethernet/mellanox/mlx5/core/en/
H A Dparams.c62 bool unaligned = xsk ? xsk->unaligned : false; in mlx5e_mpwrq_umr_mode() local
93 if (unaligned) in mlx5e_mpwrq_umr_mode()
591 mlx5e_mpwrq_max_log_rq_pkts(mdev, page_shift, xsk->unaligned)); in mlx5e_mpwrq_validate_xsk()
1189 xsk.unaligned = false; in mlx5e_max_xsk_wqebbs()
1194 xsk.unaligned = true; in mlx5e_max_xsk_wqebbs()

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