[glibc] Revert "tests: Remove target-specific huge-page size definition for THP-aware load segment alignment

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dfacfbbdbb2bb408e2c505f05b0eb2933c41b472

commit dfacfbbdbb2bb408e2c505f05b0eb2933c41b472
Author: Adhemerval Zanella <[email protected]>
Date:   Mon Aug 24 13:45:53 2026 -0300

    Revert "tests: Remove target-specific huge-page size definition for THP-aware load segment alignment"
    
    This reverts commit 224cb4a8ddd60d989790ab3da0e145c70be0a421.  The
    change broke the build of some THP tests on arc and or1k [1].
    
    [1] https://sourceware.org/pipermail/libc-testresults/2026q3/014918.html

Diff:
---
 sysdeps/unix/sysv/linux/Makefile           | 16 ++++++++++------
 sysdeps/unix/sysv/linux/loongarch/Makefile |  3 +++
 sysdeps/unix/sysv/linux/sparc/Makefile     |  5 +++++
 sysdeps/unix/sysv/linux/tst-thp-size.S     |  4 +---
 4 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 34856a3b2f..14a56d5cc3 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -730,17 +730,21 @@ tests-special += \
   # tests-special
 endif
 
+ifndef THP-PAGE-SIZE
 # Align PT_LOAD segments in THP tests to THP page size so that kernel will
-# map PIE to the address aligned to THP page size.  The maximum THP size we
-# support to align the load segments (and we skip the tests with even
-# larger THP) is 32 MiB.
-THP-PAGE-SIZE-LDFLAGS = -Wl,-z,max-page-size=0x2000000
+# map PIE to the address aligned to THP page size.  Default THP page size
+# to 2MB which can be overridden in Makefile in subdirectories.
+THP-PAGE-SIZE = 0x200000
+endif
+
+THP-PAGE-SIZE-CFLAGS = -DTHP_PAGE_SIZE=$(THP-PAGE-SIZE)
+THP-PAGE-SIZE-LDFLAGS = -Wl,-z,max-page-size=$(THP-PAGE-SIZE)
 
-# -Wl,-z,max-page-size=0x2000000 alone doesn't work for PDE when
+# -Wl,-z,max-page-size=$(THP-PAGE-SIZE) alone doesn't work for PDE when
 # text-segment address is lower than the maximum page size:
 # https://sourceware.org/bugzilla/show_bug.cgi?id=34184
 ifneq (,$(load-address-ldflag))
-LOAD-THP-ADDRESS-LDFLAGS = $(load-address-ldflag)=0x2000000
+LOAD-THP-ADDRESS-LDFLAGS = $(load-address-ldflag)=$(THP-PAGE-SIZE)
 endif
 
 LDFLAGS-tst-thp-size-mod.so = -Wl,-z,noseparate-code \
diff --git a/sysdeps/unix/sysv/linux/loongarch/Makefile b/sysdeps/unix/sysv/linux/loongarch/Makefile
index 0d5f087862..d5beb62440 100644
--- a/sysdeps/unix/sysv/linux/loongarch/Makefile
+++ b/sysdeps/unix/sysv/linux/loongarch/Makefile
@@ -12,3 +12,6 @@ abi-ilp32s-condition	:= __WORDSIZE == 32 && defined __loongarch_soft_float
 abi-ilp32d-condition	:= __WORDSIZE == 32 && defined __loongarch_double_float
 abi-lp64s-condition	:= __WORDSIZE == 64 && defined __loongarch_soft_float
 abi-lp64d-condition	:= __WORDSIZE == 64 && defined __loongarch_double_float
+
+# Align THP tests to 32MB.
+THP-PAGE-SIZE = 0x2000000
diff --git a/sysdeps/unix/sysv/linux/sparc/Makefile b/sysdeps/unix/sysv/linux/sparc/Makefile
index e0056c9413..57e73d0a14 100644
--- a/sysdeps/unix/sysv/linux/sparc/Makefile
+++ b/sysdeps/unix/sysv/linux/sparc/Makefile
@@ -14,3 +14,8 @@ endif
 ifeq ($(subdir),signal)
 sysdep_routines += sigreturn_stub
 endif
+
+ifeq ($(subdir),elf)
+# The sparc64 uses an 8KB base page and 8MB PMD transparent huge page
+THP-PAGE-SIZE = 0x800000
+endif
diff --git a/sysdeps/unix/sysv/linux/tst-thp-size.S b/sysdeps/unix/sysv/linux/tst-thp-size.S
index 154b167509..29c5f4e750 100644
--- a/sysdeps/unix/sysv/linux/tst-thp-size.S
+++ b/sysdeps/unix/sysv/linux/tst-thp-size.S
@@ -17,6 +17,4 @@
    <https://www.gnu.org/licenses/>.  */
 
 	.text
-	/* 64 MiB, twice of MAX_THP_PAGESIZE in dl-map-segment-align.h and
-	   tst-thp-align.c */
-	.space 0x4000000
+	.space 2 * THP_PAGE_SIZE