[gcc r16-6659] libstdc++: Simplify use_proxy_wait function

[Jonathan Wakely]

https://gcc.gnu.org/g:5031cc843a3ae1385c22b174c210dff41449a5cc

commit r16-6659-g5031cc843a3ae1385c22b174c210dff41449a5cc
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jan 8 14:03:01 2026 +0000

    libstdc++: Simplify use_proxy_wait function
    
    The __wait_args::_M_setup_proxy_wait function must only be called when
    _M_obj == addr is true, so it's redundant for _M_setup_proxy_wait to
    pass addr to use_proxy_wait. That address is already passed as
    args._M_old anyway.
    
    libstdc++-v3/ChangeLog:
    
            * src/c++20/atomic.cc (use_proxy_wait): Remove unused second
            parameter.
            (__wait_args::_M_setup_proxy_wait): Remove second argument.
            (__notify_impl): Likewise.
    
    Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>

Diff:
---
 libstdc++-v3/src/c++20/atomic.cc | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/src/c++20/atomic.cc b/libstdc++-v3/src/c++20/atomic.cc
index cbff5e9ba1a6..80558a1ad9e0 100644
--- a/libstdc++-v3/src/c++20/atomic.cc
+++ b/libstdc++-v3/src/c++20/atomic.cc
@@ -280,8 +280,7 @@ namespace
 
   [[gnu::always_inline]]
   inline bool
-  use_proxy_wait([[maybe_unused]] const __wait_args_base& args,
-		 [[maybe_unused]] const void* /* addr */)
+  use_proxy_wait([[maybe_unused]] const __wait_args_base& args)
   {
 #ifdef _GLIBCXX_HAVE_PLATFORM_WAIT
     if constexpr (__platform_wait_uses_type<uint32_t>)
@@ -324,7 +323,7 @@ __wait_args::_M_setup_proxy_wait(const void* addr)
 
   if (addr == _M_obj)
     {
-      if (!use_proxy_wait(*this, addr)) // We can wait on this address directly.
+      if (!use_proxy_wait(*this)) // We can wait on this address directly.
 	return false;
 
       // This will be a proxy wait, so get a waitable state.
@@ -384,7 +383,7 @@ __notify_impl([[maybe_unused]] const void* __addr, [[maybe_unused]] bool __all,
 	      const __wait_args_base& __args)
 {
   const bool __track_contention = __args & __wait_flags::__track_contention;
-  const bool proxy_wait = use_proxy_wait(__args, __addr);
+  const bool proxy_wait = use_proxy_wait(__args);
 
   [[maybe_unused]] auto* __wait_addr
     = static_cast<const __platform_wait_t*>(__addr);