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Message-ID: <20251014052738.31185-1-spyjetfayed@gmail.com>
Date: Tue, 14 Oct 2025 10:54:36 +0530
From: Ankan Biswas <spyjetfayed@...il.com>
To: akpm@...ux-foundation.org
Cc: lasse.collin@...aani.org,
visitorckw@...il.com,
skhan@...uxfoundation.org,
khalid@...nel.org,
david.hunter.linux@...il.com,
linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linux.dev,
Ankan Biswas <spyjetfayed@...il.com>
Subject: [PATCH v3] lib/xz: remove dead IA-64 (Itanium) support code
Support for the IA-64 (Itanium) architecture was removed in
commit cf8e8658100d ("arch: Remove Itanium (IA-64) architecture").
This patch drops the IA-64 specific decompression code from
lib/xz, which was conditionally compiled with the now-obsolete
CONFIG_XZ_DEC_IA64 option.
Signed-off-by: Ankan Biswas <spyjetfayed@...il.com>
Reviewed-by: Kuan-Wei Chiu <visitorckw@...il.com>
Acked-by: Lasse Collin <lasse.collin@...aani.org>
---
Changes in v3:
- Removed log about IA-64 support in upstream
Changes in v2:
- Added second hunk to diff of xz_private.h
lib/xz/xz_dec_bcj.c | 95 ---------------------------------------------
lib/xz/xz_private.h | 4 --
2 files changed, 99 deletions(-)
diff --git a/lib/xz/xz_dec_bcj.c b/lib/xz/xz_dec_bcj.c
index 8237db17eee3..610d58d947ab 100644
--- a/lib/xz/xz_dec_bcj.c
+++ b/lib/xz/xz_dec_bcj.c
@@ -20,7 +20,6 @@ struct xz_dec_bcj {
enum {
BCJ_X86 = 4, /* x86 or x86-64 */
BCJ_POWERPC = 5, /* Big endian only */
- BCJ_IA64 = 6, /* Big or little endian */
BCJ_ARM = 7, /* Little endian only */
BCJ_ARMTHUMB = 8, /* Little endian only */
BCJ_SPARC = 9, /* Big or little endian */
@@ -180,92 +179,6 @@ static size_t bcj_powerpc(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
}
#endif
-#ifdef XZ_DEC_IA64
-static size_t bcj_ia64(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
-{
- static const uint8_t branch_table[32] = {
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 4, 4, 6, 6, 0, 0, 7, 7,
- 4, 4, 0, 0, 4, 4, 0, 0
- };
-
- /*
- * The local variables take a little bit stack space, but it's less
- * than what LZMA2 decoder takes, so it doesn't make sense to reduce
- * stack usage here without doing that for the LZMA2 decoder too.
- */
-
- /* Loop counters */
- size_t i;
- size_t j;
-
- /* Instruction slot (0, 1, or 2) in the 128-bit instruction word */
- uint32_t slot;
-
- /* Bitwise offset of the instruction indicated by slot */
- uint32_t bit_pos;
-
- /* bit_pos split into byte and bit parts */
- uint32_t byte_pos;
- uint32_t bit_res;
-
- /* Address part of an instruction */
- uint32_t addr;
-
- /* Mask used to detect which instructions to convert */
- uint32_t mask;
-
- /* 41-bit instruction stored somewhere in the lowest 48 bits */
- uint64_t instr;
-
- /* Instruction normalized with bit_res for easier manipulation */
- uint64_t norm;
-
- size &= ~(size_t)15;
-
- for (i = 0; i < size; i += 16) {
- mask = branch_table[buf[i] & 0x1F];
- for (slot = 0, bit_pos = 5; slot < 3; ++slot, bit_pos += 41) {
- if (((mask >> slot) & 1) == 0)
- continue;
-
- byte_pos = bit_pos >> 3;
- bit_res = bit_pos & 7;
- instr = 0;
- for (j = 0; j < 6; ++j)
- instr |= (uint64_t)(buf[i + j + byte_pos])
- << (8 * j);
-
- norm = instr >> bit_res;
-
- if (((norm >> 37) & 0x0F) == 0x05
- && ((norm >> 9) & 0x07) == 0) {
- addr = (norm >> 13) & 0x0FFFFF;
- addr |= ((uint32_t)(norm >> 36) & 1) << 20;
- addr <<= 4;
- addr -= s->pos + (uint32_t)i;
- addr >>= 4;
-
- norm &= ~((uint64_t)0x8FFFFF << 13);
- norm |= (uint64_t)(addr & 0x0FFFFF) << 13;
- norm |= (uint64_t)(addr & 0x100000)
- << (36 - 20);
-
- instr &= (1 << bit_res) - 1;
- instr |= norm << bit_res;
-
- for (j = 0; j < 6; j++)
- buf[i + j + byte_pos]
- = (uint8_t)(instr >> (8 * j));
- }
- }
- }
-
- return i;
-}
-#endif
-
#ifdef XZ_DEC_ARM
static size_t bcj_arm(struct xz_dec_bcj *s, uint8_t *buf, size_t size)
{
@@ -509,11 +422,6 @@ static void bcj_apply(struct xz_dec_bcj *s,
filtered = bcj_powerpc(s, buf, size);
break;
#endif
-#ifdef XZ_DEC_IA64
- case BCJ_IA64:
- filtered = bcj_ia64(s, buf, size);
- break;
-#endif
#ifdef XZ_DEC_ARM
case BCJ_ARM:
filtered = bcj_arm(s, buf, size);
@@ -699,9 +607,6 @@ enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id)
#ifdef XZ_DEC_POWERPC
case BCJ_POWERPC:
#endif
-#ifdef XZ_DEC_IA64
- case BCJ_IA64:
-#endif
#ifdef XZ_DEC_ARM
case BCJ_ARM:
#endif
diff --git a/lib/xz/xz_private.h b/lib/xz/xz_private.h
index 8409784b1639..6775078f3cce 100644
--- a/lib/xz/xz_private.h
+++ b/lib/xz/xz_private.h
@@ -24,9 +24,6 @@
# ifdef CONFIG_XZ_DEC_POWERPC
# define XZ_DEC_POWERPC
# endif
-# ifdef CONFIG_XZ_DEC_IA64
-# define XZ_DEC_IA64
-# endif
# ifdef CONFIG_XZ_DEC_ARM
# define XZ_DEC_ARM
# endif
@@ -103,7 +100,6 @@
*/
#ifndef XZ_DEC_BCJ
# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \
- || defined(XZ_DEC_IA64) \
|| defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \
|| defined(XZ_DEC_SPARC) || defined(XZ_DEC_ARM64) \
|| defined(XZ_DEC_RISCV)
--
2.51.0
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